Brands who use mycelium will grow these roots on top of a grain substrate, generally rice or oats. The moment mycelium roots grow, the roots and substrate develop into intertwined and they are unachievable to different. The 2nd variety is mycelium, and you need to usually steer clear of it. https://magicmushroomsnewzealand43186.bloginder.com/27032016/indicators-on-mushroom-growing-kit-nz-you-should-know